Diestock



Dc. 23, 1941. H. o. ollsEN ETAL DIEsTocK Filed Oct. 10, 1940 PatentedDec. 23, 1941 i l UNITEDA PATENT Matter, ParklRidgegIll., assgnorsto TheNye Tool &` Machinel Works, Chicago, Ill., a corpo- Application octoberio, 19in', srial-im.scorisa 2o claims. (ci. fc4-120::5i):k

Our? invention-relates to improvements in-di'e stocks' off" the generaltype comprisingv radially movablechasers and meansi cooperating: there-ywith to control the receding' movement of the chasers as theoperationlofcutting-` the thread`1 on' an` object, such as for example a pipe;progresses. y. l

One ofour objectsisultoprovide a constructionoiv die stock ofthe'typereferred-to whichyshall be adapted for thefthreading' of' articles`offdif-A ferent diameters selectivelywithout-requiring theadjustment orrepositioning of'A the'chasers` for" the different diameter articlesvthereby facilitating the Vuse of the stockvr in the threading ofarticlesof differentdiameters. l

Another object is `to `provide a novel, simple and inexpensiveyconstruction of spring means.

Another Objectis to provide in a die stockl off the type referred toandfprovid'ed with plural sets of chasers -for articlesoi differentdiameters; a novel, simple :andi economical constructionofi meanscontrolling the-receding off the chasers'ias the'thread-cuttingoperation progresses: and' a` novel, simple andeconomical construction-l` df spring means associated with the chasersfor' yieldingly urging them to Ireceded position.` l

Another" object is to provide indexing.` or positioning'means for#facilitating!v the setting o'f` thepartsof theldie' stock forcutting'a-standardsize of threador aslightly` larger or smallerthre'ad;when desired, and other objects 'as willibe understood from'thefollowing description. i V v Referring to theac'companyin'g drawing: lFigure 1 is anend viewcfa die stock embodyingmy invention. l i lFigure-2 is affsectionv taken atithe irregular line 2*-2 on'Fig. 1 and'viewed in the direction of thefarrowsi Figure 3 is a plan View of oneof: the similar springs for urging the chasers toward recedd position;andi 'i i l i Figure 4, a View iniside elevationof the spring of1ig.3.`i The particular construction showny which con` stitutes `an embodimentof our in'ventionl--i-n'iwlhiclil` provision is made for theselective'threadingY ofy two differentdiameters off articles,comprisesia' ring member 5 havingfa coaxialhub portion' at one sidethereof externally threaded as lrepre'- sented at '15,at'which itha'sthreadedconnection with the cylindrical hub portion Bi (shownllinlpartronlyl, Aofr a holder inf which. the:articleltoivbe threaded would `be f.rigidlyy clamped;J inf accordance f with= `communi practice, the .dieistock: and work.V holder iniproducing a thread onithe,articlebeingyrelatively!rotated,l` which movement thel die stock andlworkhclder, byreasonof the threaded i connection! between them, haverelativemovementltoward eachother; Y

.The ring@ member 5wis-provided with; two sets 9i andi I Il of radialAopenings at different positions along tlielongitudinal ar'zisfofthesto'ckfor receivinglfandlguiding-twosetsf il and I2 of radially movable`tlc-ireacll`cutting chasers, each set compri'siiigifour chasers spacedapart 90?'.

The-chasers cooperate with-means for controllinglthe receding of thechasers asv the cutting ofthelthreadfonthe larticle progresses; themeans shown comprising` pins `I3` of like form. and size secured at'lone end to a-` ring Mj'ournaled onthe hub portionlofv the work holderandheldfagainst longitudinali movement thereon. lThe pins' I?,r

which atl ltheir outer ieridsl extend guidin'gly through openingslfintheringmember 5 are formed intermediate their-Yendswithv tapersurfaces IB and I1 vwhich opposeftheouterends of the setsV I'landiv I2lvofi the chasers,` respectively,

the chasers'being held at all times against these taper* surfaces'l by.spring means hereinafter descriloecl..r f I The arrangement and chasers:and tapervpinsissuch, as shown, `that thefiinnercutting ends-of the setH of chasers extend" closer*` to the' longitudinal axis of the stockfthanv the `seti |21, the? set 12 of chasers,v

way ofi example, being? provided to thread a-2'"` pipea'ndf'thels'et lllyof `chasers a 1%" pipe; it' beings understood: that the article tof bethreaded extends. into"the`dielstocki from the right handside in Fig:2;, v l

By thisV arrangement either' size `pipe may be threaded withoutadjustment or rearrangement of' the" chasers, thus: saving considerabletime iny theselective threading' ofi articles of different` diameters.

`Whetherusedi to thread one or the other of two different diameteredarticles', the chasersl operating onithe farticle move :radiallyoutwardly under: the'H control ofthe springmeans and the' taper!surfaces a of f the: pins` i3', and thus produce ther desired` taperingthread. on the article.

The spring means referred to.' preferably comprisevai setof'fspringmembersA I8; one for each ofl twoyadjacent chasers-of the sets-thereof,each member, formed `of spring wire, being shaped to` presentacentrallyoke portion I9 having a cross piece y201andsubstantiallyparallel legs 2l and 22` fromythe, outerendsfofwhicharms 23 and 24,

respectively.; curved toward the center of the yokek I9` and the crosspiece 20; extend upwardly inproportioninlg: of the upwardly convergingrelation as shown in Fig. 4 and terminate in substantially straightoppositely extending portions 25 and 26 substantially parallel with thecross piece 20 and located above the plane of the latter.

The several spring members I8 are located in openings 21 in the ringmembers which intersect the openings 9 and I0 in which the chasers areslidable,- the openings 21 containing llets 30 at their opposite endslocated in corners of these openings with their inner ends spaced apartand extending inwardly beyond the openings 9 and I0 as illustrated inFig. 1 of the fillets for one spring, the inner ends of the fillets 30affording opposed shoulder portions 3|.

In assembling the parts of the die stock the spring members I8 areintroduced lengthwise into the openings 27 to seat their yoke portionsI9 at their cross pieces 20 in the recesses afforded between the pairsof shoulders 3|', which latter prevent endwise displacement of thespring members in the openings 21, the end portions 25 and 26 of thespring members extending into the planes of the adjacent openings 9 andI 0, the pins I3 in this operation being withdrawn from the ring 5. Thechasers are then introduced into the openings 9 and I0 from the exteriorof the ring 5 and in such movement the end portions 25 and 26 of thespring members enter recesses 32 in the chasers. The pins I3 are theninserted into the openings I5 to the position shown in which operationthe chasers are forced radially inward deforming the ends of the springmembers I8 against their spring tension as shown in Fig. 2 whereby inthe use of the stock for threading an article, the springs continuouslyurge the chasers against the taper surfaces of the pins I3 during themovement of the stock along the pins toward the work holder.

It is sometimes desirable, in practice, to provide for the cutting of athread of slightly greater or slightly smaller size than a givenstandard size thread, as for example a few thousandths of an inchdifferent from the standard size thread. This may be effected in theconstruction shown as to both sets I and II of the chasers by relativelylongitudinally moving the sets of chasers and the pins I3 in a directiontoward or away from each other in the direction of the length of thepins by turning the die stock at its threaded connection 'I with theworkholder 8 in one direction or the other, as the case may be, toeffect the proper setting of the device preliminary to starting thethread cutting operation.

To facilitate the preliminary setting of the parts of the die stock foreither a standard size thread or an oversize thread or an under sizethread, indexing or positioning means are provided. These means in theconstruction shown comprise surfaces 33, 34 and 35 on the ring memberextending to different, proper, distances in a direction lengthwise ofthe pins I3.

When the sets of chasers and the pins I3 are relatively adjusted asstated to a position in which the outer end surface of the one of thetaper pins I3 adjacent the surface 33 is flush with the surface 33, asshown in Fig. 2, the chasers and pins I3 will be in the proper relativepositions for cutting a standard thread-in the example shown a 11/2 inchthread by the set I I of chasers, and a 2 inch thread by the set I2 ofchasers. When the sets of chasers and the pins I3 are relativelyadjusted to a position in which the outer end surface of the one of thepins I3 adjacent the surface 34 is ush with the surface 34, the sets ofchasers and pins I3 will be in the proper relative positions for cuttingslightly larger size threads than the standard size threads; and whenthe sets of chasers and pins I3 are relatively adjusted to a position inwhich the outer end surface of the one of the taper pins adjacent thesurface 35 is flush with the surface 35, the sets of chasers and thepins I3 will be in the proper relative positions for cutting slightlysmaller size threads than the standard size threads.

Preferably the surfaces 33, 34 and 35 will have associated therewith, asshown, indicia, such as the S -I- and signs, respectively, to facilitatethe making of the adjustments referred to.

As will be noted from Fig. 2, the portions of the taper surfaces I6 andI'I which are contacted by the outer ends of the chasers II and I2,respectively, at the start of the threading operation, are located atthe same distance from the longitudinal axis of the die stock. This isdesirable as thereby the standard form of chasers may be used and thecutting edges of the chasers for both sizes of pipes will be in theproper position relative to the longitudinal axis of the die stock.Furthermore, this feature permits replacing both sets of standardchasers for threading two sizes of pipes,` with two other sets ofstandard chasers for threading two other sized pipes, or removing oneset of chasers, as for example the chasers I2 and replacing them withanother set of standard chasers, as for example the chasers II andreplacing the chasers I I with standard chasers for threading a smallersized pipe.

While we have illustrated and described a particular embodiment of ourinvention we do not wish to be understood as intending to limit itthereto as the structure shown may be variously modified and altered andthe invention embodied in other forms of structure without departingfrom the spirit of the invention; thus while we have shown the stock ashaving two sets only of chasers for threading only two standard sizes ofarticles, it will be understood that, if desired, more than two sets ofchasers, adapting the structure for threading more than two standardsizes of articles, may be provided, the set for the largest articlebeing the closest one to the work holder and the remaining sets beingdecreasingly graduated in size therefrom in a direction away from thework holder.

Furthermore, as to the feature of conditioning the device for cuttingoversize and undersize threads described and shown in a die stock havinga plurality of sets of chasers, it will be understood that this featuremay also be provided in a die stock having a single set only of chasers.

What we claim as new and desire to secure by Letters Patent, is:

1. A die stock for cooperation with a workholder, comprising a pluralityof sets of radially movable chasers located in diierent planestransversely of the axis of the die stock, the chasers of the respectivesets, in the normal condition of the die stock, being positionedinwardly to progressively greater distances from the end of the diestock nearest the workholder toward its opposite end, adapting the diestock for threading articles of different sizes.

2. A die stock for cooperation with a workholder, comprising a pluralityof sets of radially movable chasers located in different planestransversely of the axis of the die stock, the chasers of the respectivesets, in the normal condition of the die stock, being positionedinwardly to progressiveli'fgreatera distances from the end of thedie''steelty nearest" the workholder' toward` its 010-" posits and;`adapting@ the die stock forthreading articles of"di'ilerent sizes,andfmeans for permit'- ting 'radiali outward movement of thev chasers-5` during-the v'threading operation.

3:'.A1..di stock for Icooperation with a workholden' comprising 'aplurality of setslof radially mvabl'eichasers-locatedlin diiierentplanes transverselyofthe axisloiftheidiestock, the chasers 10.

of!therespectlvefsets; in the normal condition ofthe-di`e steckf, beingpositioned` inwardly to progressivelygreater! distances fromthe end lof'the.A die stecknearest-#the workholdr towardf its opposite en'd',4adapting theidie' stocky for threading 15 art-icl'e's of different!sizes, "andi means for permitting radial?outwardmovementf-oflthe`chasers 'during. thel threading-l` operation, said means includ"-`in'g.` atapere'd member againstf` which a Chaseroffeach;setlthereofibears, said mcnfllicltlldl die stock beingrelativelymovable as the threading proceeds` A p .41-In af die"V stock, the`combinationl cf aY ring member,` setsloi: chasersulocated in differentplanes ofi and simultaneously urging the chasers of 'each 30 set intocooperative relationship withl saidrneans.

.5; In adief stock',` the'` combination of a ring member, setsi of.'chasers llocated in different planes; transversely of the axis ofl thedie stock and .radially slidable in said ring member, means controlling.theradial ,outwardimovement of said chasers,xand spring devices on saidringmember eachihaving endtportions engaging Witha chaser ofi each`setiv thereof. and. simultaneously urging the chasers; of-A each. seti.into; cooperative relationship 4o withlsaid.y means.. l

6..,In..a1.die.,stock, the combination of a` ring membergfsetsoflchaserslocatedin differenttransverseplanestspaced along the. axisofthe die stock and :,radially slidable in said ring memb'enmeanscontrollingfthe. radial .outward movement` of sa'id chasers, and.spring.` devices.` on said? ring member eachv having` aI holding portionbetween its ends at which it is held to said ring member,- springendrportions .engaging-with a`chaser of each set thereof Land.transversef portions; connecting said holding portion and said. endportions together, s'aidispringVA devices yieldingl'y urging` thechasers intocooperative .relationship `with said means..

7;' a4 die stock, the combination of a ring 55tions.connectingfsaid'holding portion and said 65 end portions together,said spring devices yieldingly urging the chasers into cooperativerelationship with said means.

8. In a die stock, the combination of a ring member having radialguideways located in different transverse planes spaced along the axisof the die stock and openings extending crosswise of, and intersectingsaid guideways, sets of chasers radially slidable in said guideways,means controlling the radial outward movement of said chasersgf andispring devices located inl said-'openeingsi'aeh 'havingl endE portionsengaging with a chaserpffe'ach set tlfereof 'and urging the chasersinto! cooperative relationship-with said means.

9i In? "a--die stock', the combinationl of. a ring memben having radialguideways located in different 'transverse` planes. spaced along theaxis ofthedie st'c'ck'va'nd openings extending crosswise'A of, 'andiintersecting,` said'. guideways, inwardly extending spaced apart stopsin said .openings,,setsf of" chasers radially slidable in said.guidewa'ys; means controlling the radial outward m'ovementlof: 'said'chasers, and spring devices locatedinsaidl openings each having. aportion entered betweeni said vstops and held therebyl againstlengthwise" movement and end portions engaging a chaser of each setthereof. and urgingthe chasersinto` cooperative relationship withsaid'means;v

"101' In a die stock', the-combinationoi a ring',v

member` having;v radialY guideways located in; diiferentl transverseplanes spaced along the axis oft the; die.- stock and openings extendingcrosswiseY ofi, and intersecting; said giudevvays,` in- Wardlyfextendingspacedapart stops in said openings, sets of chasers radially slidable insaid guideways; .meansk controlling the radial outwardl movement .ofsaid chasers, and spring devicesv lo` catedlin said` openingseach havinga portion entered betweensaid stops and held .thereby againstvlengthwise movement and transversely extending portions terminatingin'outwardly oppositely extending end portions for engagement withafchaser of.' each set thereof land urging. the chasers into`cooperative relationship with said means.

11.,In a. die stock, thefcombination of a ring member: having. radialguid'eways located in different* transverse planes'spaced along the axis`of the die stock and openings extending crosswise of',V andintersecting, said guideways, inwardly extending` spaced apart stops insaid openings, setsoflchasersradially slidablein said guideways,meanscontrolling the radial outward movement of said chasers,` andspring 'devices located insaidf opening'sieachihaving afportion enteredVbetween said stops and' held thereby against lengthwise movement andtransversely extending coil portions terminating in outwardlyoppositelyv extending: endr portions for engagement` with a Chaser of'each set .thereof and urging the chasers into cooperative relationshipwith said means.

I2. In adie. stock, the combination of a ringy member, chasers radiallymovable in said ring member, and tapered members against which said.;chasers bear, said chasers and tapered members being relatively movablein a direction lengthwise of.' said tapered members, said ta.- peredmembers permitting radial outward movement; ofsaid chasers during saidrelative movement, said ring" member having a plurality ofcircumferentially spaced surfaces extending forwardly to differentdistances in a direction lengthwise` ofthe tapered members forcooperation with` ends of said tapered members for determiningthe-proper relative positioning of` said chasers and tapered members,preliminary to starting the cutting operation, for cutting a standardthread or a slightly oversize or undersize thread.

13. In a die stock, the combination of a ring member, a plurality ofsets of chasers radially movable in said ring member, said sets ofchasers being located in different planes transversely of the axis ofthe die stock, the chasers of the respective sets, in the normalcondition of the die stock, being positioned inwardly to progressivelygreater distances from the end of the die stock nearest the workholdertoward its opposite end adapting the die stock for threading articles ofdiierent sizes, tapered members against each one of which a chaser ofeach set thereof bears, said chasers and tapered members beingrelatively movable in a direction lengthwise of said tapered members,said tapered members permitting radial outward movement of said chasersduring said relative movement, and means, including portions of certainof said tapered members for indicating the relative positioning of saidchasers and tapered members, preliminary to starting the cuttingoperation, for cutting standard threads or slightly oversize orundersize threads.

14. In a die stock, the combination of a ring member, sets of chaserslocated in different planes transversely of the axis of the die stockand radially slidable in said ring member, the chasers of each set beingcircumferentially spaced, means controlling radial outward movement ofsaid chasers, and spring devices on said ring member each having acentral portion adapting the device to be held in position on said ringmember and transversely extending portions terminating in outwardlyoppositely extending end portions for engagement with adjacent chasersof each set, said spring devices yieldingly urging the chasers intocooperative relationship with said means.

15. In a die stock, the combination of a ring member, sets of chaserslocated in different planes transversely of the axis of the die stockand radially slidable in said ring member, the chasers of each set beingcircumferentially spaced, means controlling radial outward movement ofsaid chasers, and spring devices on said ring member and each having acentral yoke portion adapting the device to be held in position on saidring member and transversely extending coil portions on the arms of theyoke terminating in outwardly oppositely extending end portions forengagement with adjacent ,.f

chasers of each set, said spring devices yieldingly urging said chasersinto cooperative relationship with said means.

16. A die stock for cooperation with a workholder, comprising aplurality of sets of radially movable chasers located in differentplanes transversely of the axis of the die stock, the chasers of eachset being circumferentially spaced, the chasers of the respective sets,in the normal condition of the die stock, being positioned inwardly toprogressively greater distances from the end of the die stock nearestthe workholder toward its opposite end, adapting the die stock forthreading articles of different sizes, the adjacent chasers of said setsbeing disposed in line longitudinally of the die stock.

17. A die stock for cooperation with a workholder, comprising aplurality of sets of radially movable chasers located in differentplanes transversely of the axis of the die stock, the

chasers of each set being crcumferentially spaced, the chasers of therespective sets, in the normal condition of the die stock, beingpositioned inwardly to progressively greater distances from the end ofthe die stock from the end thereof nearest the workholder toward itsopposite end, adapting the die stock for threading articles of diiTerentsizes, the adjacent chasers of said sets being disposed in linelongitudinally of the die stock, and means for permitting radial outwardmovement of said chasers during the threading operation comprising ataper pin for each aligning pair of said chasers.

18. A die stock for cooperation with a workholder, comprising aplurality of sets of radially movable chasers located in differentplanes transversely of the axis of the die stock, the chasers of therespective sets, in the normal condition of the die stock, beingpositioned inwardly to progressively greater distances from the end ofthe die stock nearest the Workholder toward its opposite end, adaptingthe die stock for threading articles of different sizes, and means forpermitting radial outward movement of the chasers during the threadingoperation, said means including taper pins each having a plurality oftaper surfaces so disposed that one Chaser of each set thereof bearsagainst said taper surfaces, respectively, said pins and said die stockbeing relatively movable as the threading proceeds.

19. A die stock for cooperation With a workholder, comprising aplurality of sets of radially movable chasers located in differentplanestransversely of the axis of the die stock, the chasers of therespective sets, in the normal condition of the die stock, beingpositioned inwardly to progressively greater distances from the end ofthe die stock nearest the Workholder toward its opposite end, adaptingthe die stock for threading articles of diierent sizes, and meanscomprising taper pins with spaced chaser-engaging portions thereon forpermitting radial outward movement of the chasers during the threadingoperation, the portions of said taper pins which are engaged by thechasers of said sets at the start of the threading operation beingspaced the same distance from the longitudinal axis of the die stock.

20. In a die stock, the combination of an annulus having a circularseries of spaced apart housings extending therefrom lengthwise of thedie stock, sets of radial chaser-ways in each of said housings, saidsets being located at diier- HARRY O. OLSEN. ALBERT J. MATTER.

